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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79c9fac5b5e34cb3f158363ae1b3f6cb6904892c51608974812f4d0c54b86492' 
  AND token = 'J0iAMykrM7GqbCBHdcsldmj0hO3kSEy0rF5bwEYlPgk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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