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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90ff6b9bdd2f27aa13d3d0dba613c8b264ac372912a97d3ed62ba34cab9d4498' 
  AND token = 'uSrFG244z7agSWxHw5dBNXoZNENrz7rqfgTspQKRcFE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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