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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b7376f8e75a9d972fb874de7bc703fb65905c2837f0540771e694b6f946f9b9' 
  AND token = 'VaXmwQT0hRR3SMq6bwKJrm1Zu1HIU2sYi6zv6YHQR6s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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