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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e98165246dd233d2baefe9198d9ee877814b16499400d9fb34fd363733a9235' 
  AND token = 'EpRRDaiQgC5abQWSi6Ovv5CXYhKIx1mLpk7cVS+5eRc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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