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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e4282b5cd2f1538d800901344f78f5f942834d454ec09ec14b915f88d6180397' 
  AND token = 'SqKW7qWTofPl6YZZ13yulLpw+HSnhxthRGKKqts9hW0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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