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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '337d102c9e02f93a161ef1c234eeff96ee3019b9f9178c02591be25b4026d0c6' 
  AND token = 'iQbi75wnREf7ZGGkEgP7icf488gIm5xLNq/DJ/r1350=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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