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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1bc640696450ff4d5ff0345e3372bd745cf7070dc750284aeb091682fe4e20b' 
  AND token = 'UTxC/67Vo/zfHtSbUSFNGE8si41r8dvPZYbPARQId18=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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