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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d4193ba937c6999e3ef01004ce516bf8db9eb77dae40d44e0ef541a922b73e2' 
  AND token = 'JEkiKwoPE7TashuWPOzEBcRFmrQYugwIv7ghtTlpf1M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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