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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff8ef3d836a2b46cd48c35e3271927f4873c82b40a19c68472a6f77134570222' 
  AND token = 'oGy3lx7tBPKriMm+4EmvNcigDN9AdBsd+qpizQpeluU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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