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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1af551752706726d2210c29a02b4a7ffef2087e49543e03f431c391175f062f9' 
  AND token = 'B9F4K8m1Z1QumNN3h18BEOBX+UIk1vL+OwijPr7m6PE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00125

JSON explain

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