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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff215aee0553f8b30989063891eedf0d45659f3068dc757e108b5421b4702d8c' 
  AND token = '910kM/O9MvLELTG9iOnG1POu8JF4cuu260C68YRLD3o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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