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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e0ae7da0200a4350a65221d4607293c4bec669b90e37e7c3443fa4f53ff939b2' 
  AND token = '2nyCSFwDQwFtmCp4kzGGuHht4xX7E5jIvPlRAVi2GkY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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