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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '53c63bd9200cda6f3f642603ea2502237eb9e120cc71a02fee93bcf47d978ab4' 
  AND token = 'xkHxU5jfLBA89oP+hmUuoqWXF+Ywc11CAkhW7UhPlbo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00101

JSON explain

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