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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6cda21379a7c427e6578e963857e748bc508e597b1a82506d58cdc814e507b91' 
  AND token = 'ykmBrIklIrmpi5XW5dmILmossAsGqoXhY4vgAJYXmIE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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