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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3eb55916c7df0e7a900d3e0ff5a5be23c24f3cdd62d55a07f10361bd6dd5e7f' 
  AND token = '+VU/GkR1q74p7qRx1yki8l521eCHx5X/CtTGp5NqKWI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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