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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e67c134cc17305fa05e51dfae437ee33f1ff3c7a3b1f2ef6510e151f6b00870' 
  AND token = 'nZviBNC0zby5IdLF9MIXML9h7gSW6qDIAhvpyIElWfQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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