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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99563805eefa25f6d44b379fe19ef6a52ad5359d8514e63cbb87b1c5aaa4a37f' 
  AND token = '345/OLsxp2mnY79yQ93Knq44Xq3irEyz4qJ9MPqdXHw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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