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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df8166e240bcc24716fb7db682b80c2537612882c2c2850bc38b980f37a7524d' 
  AND token = 'uJUpSKqJHgKldCdzUtQRfdtXzzohfvgpzD27BsAJKEM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}