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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da6271a1e47ca2923aa368db9b7f5dc3e1d9a3cf44b6906d11b13d45bb3689d1' 
  AND token = 'WjFGP7jLB8M3PVxUyEDObi06B2IEAyYc9QmMwMAvzIg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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