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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6233ab926e1bc6a5c9c2a2cb0dc011296b08f74e94894ea986e35e9715376b4a' 
  AND token = 'smjJm5CcMm471TjT41tBwAn/+nD3wIV4lCCokvAbBTU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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