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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93177be3639aad3d999a9de59cea50b8c1a997a9fec92b001eba92e3d68059d4' 
  AND token = 'H9c40cGbxLRX0pwFwCDgT2yMTXeU+xf3V9coYpIGMoo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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