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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f1dc2c11e7ea67962ab96f91c0dd777d0dc41f574bbd859a8cb084a4bae7e041' 
  AND token = 'Wwn2owwJIlR5nG57oTUQSWWPLEcEggLuETwHHtsa4Rk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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