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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17c2333e8e80b7ec9e09c7869c04e6f2598373c78b89865c28d3793567b97dbd' 
  AND token = '2i0F5KNCFUM9m75uA31REDUtbSud1c/lrpn+A58YJ0o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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