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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '960963a91f9998f9e084a137f75d59f440a191044a3a8d5617857adabd911d80' 
  AND token = 'DxqsqO4rBIqfS2MJ+S7KTCAWpt66ccVMx7YOiVKEOg8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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