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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cdc7b403792d0f73cc9cffc1577fb42fbf24826614d3c2db7f0ff625bc9dd1fe' 
  AND token = 'iORg8yYgJcqhbYX8ZtUhHwc8pSNtIvb9u7IhxUgyq4c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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