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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9da40e9396d48a55f327a0209d9ad3e1fb4bbb9f3a240118731b898bc1894299' 
  AND token = '0QrmBJXBdNWjhfFqEL79T7kb1GIJzBZzxI65i9IbTtM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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