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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '699c843f455780ff28c46acba28ca72c9082705c306e601da3999476f3914b23' 
  AND token = 'uQIbALTbvx63tKkOmW02mDL5nq4WN1AF0JVDTxlE7os=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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