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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c333260041d93e458f7208dcf68cd796ad040fdfa88830a4b7b7611f03323a02' 
  AND token = 'qyxw+o7BRUlpw+qYdBZ6JDaI96OylHfjt0asdumUCsg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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