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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93f2509f1dcc1b14dd36184fb03983ff337d1cb9713b502b7b88a4c579cc5edc' 
  AND token = 'lzoejkKhnKo6y8WiwJ1z37R56SsTCqMC5SGcPX1nnMc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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