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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03dab168de1e9d2a1c8a6c8497b8358089728da78d297993dcbeebd17aad1396' 
  AND token = 'PaZMFyv4gnOr/gSGns4uXmfbJ+wYWtF2465MiC93T9w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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