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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8454c9d8b3652f839def4d1915a0702620420419c6f476d57ecdc015f9000b42' 
  AND token = 'xzI35fn3GB6s33uIqVXe23ja6rAmIQHtOi+2HFCfALM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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