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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97cd59a4a1899aeaeca0e854dfe3e6c786810622c7adbf03c40a10f1abafa03c' 
  AND token = 'u6esS/g6WEmBVeiICuUENq11wNHjsPwUE9DhY6H5SSk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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