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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a12fa2f1bb8f24c16b64baff5cd32c313d43f94f2b436191af3756d2a2f05c5b' 
  AND token = '27us3loalqwhEJao3GCFx/ieaUom3V/ueMZxvRE+pWo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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