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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b1ab894545734fd7079c0b6ca0d0c633731c7d98601dc064e4bfab257c0c4c4' 
  AND token = 'Jvh6Hx0SLnKlatFvnXh/8oMfcj9webKtEEjNYnJo1v8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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