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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67d3141cb273168b170408e4ccb085b58fb49f9f8495d525d878e14c771fb77a' 
  AND token = 'pCoawzqtDjn6f56MA4oeQ/c3F5mR0BV7P8h+4xrLMNs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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