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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f190b5d6b51dcb3bb81984c72d4a1e73a63e8dd58fe8f8a8b10c3b749b2686c5' 
  AND token = 'Ji1UEzUpz9bIeW3PcvAQ63HeEUB8AzV5YOqIjXaYlo0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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