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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8305c12c29a769474a1f20f864351c10eb7f9807e687327cbc9dedb034668c55' 
  AND token = 'tXWPSIxk89uqtx+h1L/urPpu9xIQxifqpLSf4oNRX3o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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