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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '913094d9e5eb6f1de2e93cd92d55993c887692e7da1b046e4466c413b6bb3187' 
  AND token = 'VKqeoKel+pF80ErdYndfoj9wkjLkVBVnJ6T7ZuyMxTM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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