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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9a9114102d35cbf36df629a9494c051497ffe0312eecfae8bb2a609b8647b9b' 
  AND token = '4s6Zzr5kopVZgznHmbzMgTnruKEjywzTFY8EYEjehJE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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