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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67b406893bf6f041fffd7771d4cdc4b9425aea84cef461e74edff2ccdc98ff63' 
  AND token = 'Ay5TDjlA6H8J74VGmYORpak3sk/P73podfuNcu3A+84=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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