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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd93988b04954ec8332075cfa4c61add04486120b8cd3ff44313751b3c1ee560e' 
  AND token = 'KjOFiHLDALopmwXwfL80JDJ+fnwd3psvDVuq3I46LU8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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