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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6e84028ca2c191a43dc3d94b3e39b50364b4e9053dd34124854e857efe8fc62' 
  AND token = 'PYS63SMgj/BZyXEvQW/yVcrOxWyUCWwedhb7bnu658o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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