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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab81bf1eb5388d041f672e5ac07b725f3f82a3935b6a5c3de5c05f440976974d' 
  AND token = 'Uz/TFiRP1/N7pRpSgEUGOLaz43cZoD6ADyo3oPrHI9c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00061

JSON explain

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