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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3cd84da1d5c9b319050a032b2fa651892bdbdffcab7427d4efd8a55d6e8809e' 
  AND token = 'y6dF3NODciFDglly8oBcK+1a8OSga1uzKsnMY/wcurc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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