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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '341a74d54f16721b84d3334830e163a18ec84285747cbdd263cf7f10d3facffc' 
  AND token = 'EA3wQWWfBZ7U+0L74X4esr84EpAQe2XQZftuczE1wTw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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