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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9781d6e8ac179aebc89eedeeed22c3f7300e27ba19ec916247df0aa512ecf468' 
  AND token = 'L/MWOWgMYbOtoLB0qPnK7tdCDfg7C6IJfm7VOJKBebo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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