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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ccec909dca0dea03fda8f656eb31ee7161c4730693a71bda706185a4ff84d55' 
  AND token = '1skRcqpKUyo+xUdvb8BgdDWKbD2G2ncXZJuI6M5QD9g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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