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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '72359fdb8dda29cb76dc2320d604fda55969a5b119bb0c25f34f9e27dca3570b' 
  AND token = 'OZEvEf5R7oYkea+ZsB9Lqo0GYS6jJbTdG/hTZb6XTAI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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