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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3dd7a8b33228dd9e6d4b9b5d9c6e9b852daa90d3a96d08647f52692947918be6' 
  AND token = 'HYBQ8OvbseOnkR7u9agLhb1ymhOhSjbKtkOEoWS/eyU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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