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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c47ece16be22d2401d35305b52ab5a6c8a16dca77fe1682342480b3319fe5f5d' 
  AND token = 'ETjG+nPJEsLjRs/alQcFzzFiK++Sa1tk0pTWaldtNJU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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