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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96a8fdeffa6e34d2e969da4f1df7d3d9ed4fd11d9e52dc5c1e2ff876137a0d7c' 
  AND token = 'IecYTpr0/e2BSwZZi6hr8eTd4Oug+7JCmGlTyKphB4k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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