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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2b76753d26d20362d9dd899d32d9a39c6e224f005846a26b9450cbb113e3bb3' 
  AND token = 'ELIF2OO21vCDu0cFIK+UG3/Rb5Y8s8gXHvgynXW+FoE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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