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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e6559c41a7e3699fabfe301c18a32008cbcc2317f0e8b86ca497f51cddbf4b87' 
  AND token = 'bdD1QQ6OgaJ2f31tsxCrK5Bc9b1nOd2/dr7gq1t006w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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