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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b09654b320bc15298d3315867085a964485dc905009f8d9ec684f32b176f727d' 
  AND token = '1S0M334KaBJ7K69LKv7aAhLbzVSTKX7C3V5AsW+D4Go=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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