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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '81cdf5b9ca098c8b534d594055868acb1bdb61ebcc27e60b41de521cfe00f478' 
  AND token = 'Wc2trum6jmUEnsGJonbqiFmYvNDzw61NA32SkWiyO5I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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