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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60d84369e14b0d35a8f3f760a7a552522dd501e29c688562750cd1455da78b99' 
  AND token = '02Jwld/JbmVVb92JjNFBWfNyv99Ut5i/zQKsDOTQ438=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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