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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29db227c2b11abc596a19792ca0d674902c1f75552bcc974dde14fc192af545c' 
  AND token = '6zOphtlpKNa8ahd24I0bTkvKLD59tvHx7YGxrPlImcA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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