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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e75ae0e1403ab1d3938e540cff9b1ec1cd1ad776d7d1d9d04bb5ea1662666e8' 
  AND token = 'ft2/40+yPCD8xrpmXKgD8hfy59ZxqFAkQJgi8Ig59FE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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