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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd69c9d5372c63d6934e1d9f7d685588eee01710961ce159932ba44c15a19992f' 
  AND token = '/Npcbtw6f+clMPPrPZlx8QbgekJ74EziZ+Gt1SWLtDo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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