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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f3c9d45d066f421514e62d4262c5141eaccd87c7ce948fbe218cc8d037d58c8' 
  AND token = 'RwwR1s6fhkuCisxixLGnWPwV7mBL2FALREIwzXgi61g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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