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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9eeb329773616eec56130a76e20260a16d6e7e0f67496218f441f2e8b4ee1b08' 
  AND token = '0awISEFZYm8BSL6h4FP0ePsGyDij64HL7XGyWUMF9BI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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