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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '561da7ba8731c9613c3f3a4496fc6ccaa4efe2e65bca2a4fa67fd4718c17588c' 
  AND token = 'kQNLCh4cTXpXUlRQk3dhRN9YGFCgi9xkjis5q942s/Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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