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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '50ef93d76c06b14d85e480c7ff32dda76c303a56d2f9c5db461484c3c09acc5b' 
  AND token = '82cg7ny8TNYiWsSKUT4yUJOtoSoka81E+Jw4CzlYn2o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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