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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3d819a7285d203c781d6e5cdc7de16d97f9601b1e1da516d700673b22121ab2' 
  AND token = 'fS5FBWnfFEfwCI9TjOEUDPBJ0t9cx9PuH+KCAoPeO9k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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