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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c46a4fe737d8d81a4c8e21576c3ced0d20658526704ad0d87b7b3f1a4ff225ce' 
  AND token = 'rwPfDoi6uktXSuUsuydcShZ1X0hebQUh+EWERSZ2vYo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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