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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2930e4857b6cfc81973a60575952935d2bb6fa7107a7e296d0a57fc2792c384d' 
  AND token = 'KMsCueQfjaNRqEpUTPQuWuE3hO1wXUvqfLYnbasdJSM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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